Fuel cell engine shutdown purging system, control method thereof and fuel cell system

A fuel cell and control method technology, applied in the direction of fuel cells, electrochemical generators, circuits, etc., can solve the problems of reducing hydrogen utilization, affecting engine starting, stack damage, etc., shortening cold start time, and increasing utilization. , the effect of reducing performance

Pending Publication Date: 2022-03-25

BEIJING SINOHYTEC

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AI-Extracted Technical Summary

Problems solved by technology

The phenomenon of failure due to the freezing of infiltrated water will affect the second start of the engine; if the anode is blown with air, the anode will inevitably form a hydrogen-oxygen interface. At this time, the anode potential will drop significantly, and...

Method used

Specifically, after the experiment is completed, according to the set control program, the hydrogen is automatically switched to be nitrogen, and the permeated water on the anode side is purged, wherein the water-steam mixture passes through the effect of the water dividing part 4, and the water is discharged through the tail valve 5 to Atmospheric, gas passes through the circulation pump. Pass through the circulation pump and take away the water in the circulation pump. At this time, the three-way valve 6 can be opened to prevent this part of the water from returning to the anode again, forming an invalid circulation. The water-steam mixture is directly passed to the front end of the air intake throttle valve 8 to the cathode, and after the cathode is purged, it reaches the rear throttle valve...

Abstract

The invention provides a fuel cell engine shutdown purging system, a control method thereof and a fuel cell system. The purging system comprises a regulating valve, a hydrogen jet, a water diversion piece, a tail exhaust valve, a three-way valve, a hydrogen circulating device, an air outlet throttle valve and an air inlet throttle valve, an inlet I of the regulating valve is connected with a hydrogen source, an inlet II of the regulating valve is connected with a nitrogen source, an outlet of the regulating valve is connected with an inlet I of the hydrogen jet, an outlet of the hydrogen jet is communicated with an anode inlet of a galvanic pile, and an anode outlet of the galvanic pile is connected with an inlet of the water diversion piece; the outlet of the hydrogen circulating device is connected with the inlet of the three-way valve; the outlet of the three-way valve is connected with the inlet of the hydrogen spraying device; the outlet of the three-way valve is connected with the inlet of the air inlet throttle valve; the outlet of the air inlet throttle valve is connected with the cathode inlet of the electric pile; and an inlet of the air outlet throttle valve is connected with a cathode outlet of the electric pile. The cathode and the anode are purged by the same N2 gas source, so that formation of a hydrogen-oxygen interface is avoided.

Application Domain

Fuel cells

Technology Topic

ThrottleNitrogen source +5

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Examples

Experimental program(1)

Example Embodiment

[0034] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the embodiments of the present disclosure are shown, it is understood that the present disclosure can be implemented in various forms and should not be embodied herein. In contrast, these embodiments are provided to make the disclosure more thoroughly and complete, and can integrate the scope of the present disclosure to those skilled in the art.

[0035] The term "comprising" and deformation thereof in this article indicates that openness include, ie "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially" based on. The term "an example embodiment" and "one embodiment" represent "at least one example embodiment". The term "another example" means "at least one additional embodiment". The term "first", "second", and the like can refer to different or identical objects. Other clear and implicit definitions may also be included below.

[0036] Such as figure 1 As shown, the embodiment provides a fuel cell engine shutdown purge system including a regulating valve 2, a hydrogen spray 3, a partial water supply member 4, a tail valve 5, a three-way valve 6, a hydrogen circulating device 7, an air intake valve 9 and the intake air throttle 8, the import of the regulating valve 2 is connected to the hydrogen source, the inlet two and the nitrogen source connection, the exit is connected to the inlet of hydrogen spray 3, and the outlet of hydrogen spray 3 is transferred into the anode inlet of the electric pile 1, The anode exit of the electric pile 1 is connected to the inlet of the divided space 4, and the outlet of the separation member 4 is connected to the inlet of the hydrogen circulation device 7, the outlet 2 and the tail row valve 5, the outlet and the three-way valve of the hydrogen circulation device 7. 6 Inlet, the exit of the three-way valve 6 is connected to the inlet two of the hydrogen spray 3, the outlet of the outlet 2 and the intake throttle 8, the outlet of the intake throttle 8 is connected to the cathode inlet of the electric stack 1, out The inlet of the gas festival 9 is connected to the cathode exit of the electric pile 1.

[0037] Preferably, the discharge port of the tail valve 5 is connected to the mixing point, the outlet of the air intake valve 9 is transmitted to the mixing point, which avoids environmental pollution, and convenient cleaning, saving manpower.

[0038] Alternatively, the fuel cell engine shutdown purge system also includes a controller 10, and the controller 10 is connected to the adjustment valve 2 and the three-way valve 6 for controlling the opening degree of the control valve and the three-way valve 6, the controller 10. After the program is set, it is possible to automatically control the gas switching and gas flow in the setting program, reducing the uncertainties caused by manual switching.

[0039] Preferably, the controller 10 of the present embodiment is a host computer for easy viewing and operation.

[0040] Alternatively, a high voltage sensor and a low pressure sensor are provided in the hydrogen spray 3, which facilitates the pressure of the gas to control the pressure of the inclusing gas. Further, the tail valve 5 is provided with a heating member, which can heat the gas to achieve a suitable emission temperature. Preferably, the hydrogen circulating device 7 of the present embodiment selects a circulating pump, and an emitter may also be selected.

[0041] The present invention also provides a control method of a fuel cell engine shutdown purge system as described above, comprising the steps of:

[0042] S100: Set the control program of the controller 10, specifically, the program must engine through the process of "standby → self-test → start → run → drop";

[0043]S200: Switch the control valve to hydrogen as nitrogen, specifically, can open the adjustment valve 2 by an additional VCU controller 10. Due to the same gas source, the hydrogen oxygen interface that is damaged by the anode side is not formed by the inert gas N2 due to the same gas source.

[0044] S200: Controlling the stack pressure of 140 kPa-160 kPa (undressing) to perform anode purge and cathode purge,

[0045] S300: Open the exit of the three-way valve 6 to increase the utilization of the gas source.

[0046] Preferably, the mode of the anode purge and cathode purge in S200 is a pulsed drum wind purge, and the principle is downtime, and the heat pile 1 is blown out by the gas, and the second opening difficult problem is avoided.

[0047] Further, the S200 is inserted into a pressure of 150 kPa, which can achieve a better purge state, and the gas is too small or too small to purge.

[0048] Specifically, after the experiment is completed, the automatic switching of hydrogen is nitrogen, the penetration water on the anode side is automatically switched, wherein the water vapor mixture is formed by the moisture portion 4, and the water passes through the tail valve 5 to the atmosphere. After a circulating pump. After the circulating pump, the water in the circulating pump is taken away, and the three-way valve 6 can be opened to avoid this part of the water returns to the anode, form an invalid cycle. The water vapor mixture is directly connected to the front end of the air intake air throttle 8 to the cathode, and after the cathode is purged, the tail drain valve is reached, and the rear to the atmosphere, and improve the utilization of the gas source. The waste of N2, passes through the three-way valve 6, flows to the cathode, providing a cathode purge. Cathode purge and anode purge are not divided, most of the time is carried out simultaneously. The cathode and the anode are purged with the same N2 gas source, which avoids the formation of the hydrogen-oxygen interface.

[0049] This embodiment also provides a fuel cell system, including electric stack 1 and the fuel cell engine shutdown purge system.

[0050] Compared with the prior art, the fuel cell engine shutdown purge system and the control method thereof and the fuel cell system thereof are added to the set of adjustment valve 2 and the three-way valve 6. The flow direction of the gas can achieve the gas purge of the yin and anodes. Specifically, the present invention has the following advantages:

[0051] 1. It is enough to reduce the liquid water inside the circulating pump after shutdown to shorten the cold start time.

[0052] 2. Form a separate circulating gas branch, purged with nitrogen, and does not need to be largely changed to the system architecture.

[0053] 3. Prevent the formation of the anode side hydroxide interface, resulting in corrosion of the C vector, reducing engine performance.

[0054] 4, increase hydrogen utilization, reduce costs.

[0055] 5, the same gas source, the same pressure, and eliminate the occurrence of hydrogen oxygen.

[0056] 6. Reduce human error factors brought by manual switching gases.

[0057] Embodiments of the present disclosure have been described above, and the above description is exemplary, non-exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes in the art will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The selection of the terms disclosed herein is intended to be the principles, practical applications, or techniques for techniques in the market, or other one of ordinary skill in the art will appreciate the embodiments disclosed herein.

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Description & Claims & Application Information

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Proton exchange membrane fuel cell low-temperature cold start box capable of realizing uniform heating and control method thereof

ActiveCN111129540AGood heating effectReduced cold start time

Owner:JIANGSU UNIV

Control system for service robot

InactiveCN110587634Areduce performancesimple design

Owner:SHENZHEN SANBOT INNOVATION INTELLIGENT CO LTD

Classification and recommendation of technical efficacy words

reduce performance
Reduced cold start time

Fuel cell engine shutdown purging system, control method thereof and fuel cell system

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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